Global Patent Index - EP 0418027 A1

EP 0418027 A1 19910320 - A cooling fan for rotating electrical machinery.

Title (en)

A cooling fan for rotating electrical machinery.

Title (de)

Ein Kühlgebläse für eine drehende elektrische Maschine.

Title (fr)

Un ventilateur de refroidissement pour machine électrique tournante.

Publication

EP 0418027 A1 19910320 (EN)

Application

EP 90309920 A 19900911

Priority

US 40815489 A 19890914

Abstract (en)

A centrifugal fan for ventilated rotating machinery is provided having tapered fan blades (46,47) to reduce sound pressure levels generated by fan operation over a wide speed range. The tapering of the fan blades (46,47) keeps the cross-sectional area of each flow channel (51) substantially constant as the air flows radially through the fan, resulting in a less turbulent flow. Each fan blade (46,47) may include a height profile having a tapered segment (55) in which blade height decreases in proportion to increasing radial distance from the central axis (49) of the fan.

IPC 1-7

F04D 25/08; F04D 29/30; H02K 9/06

IPC 8 full level

F04D 25/08 (2006.01); F04D 29/30 (2006.01); F04D 29/66 (2006.01); H02K 9/06 (2006.01); H02K 19/22 (2006.01)

CPC (source: EP US)

F04D 25/082 (2013.01 - EP US); F04D 29/30 (2013.01 - EP US); F04D 29/5806 (2013.01 - EP); H02K 9/06 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0418027 A1 19910320; EP 0418027 B1 19950823; CA 2018816 A1 19910314; CA 2018816 C 19981110; DE 69021808 D1 19950928; DE 69021808 T2 19960118; JP H03107348 A 19910507; JP H11122 U 19990907; US 5021696 A 19910604

DOCDB simple family (application)

EP 90309920 A 19900911; CA 2018816 A 19900612; DE 69021808 T 19900911; JP 19898090 A 19900726; JP 835198 U 19981023; US 40815489 A 19890914